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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c3cd3b473f7e8dde387232a7ecc7132780886df71d15d58e83d4a119b2a1a3d' 
  AND token = 'L0RJfESLCPqfX4iNcmBHLHFxRmA0rdbAhik5gUvXjfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}